I never really posted what all was involved in getting the JDM door panels to work in my USDM car. Since the driver's side switches were now on the passenger side, I had to swap them around somehow.
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I started by drilling the plastic welds out on the back side, then popped the whole assembly out where the handle is. Then after fitting it onto the other door, I used a soldering iron I didn't care about and some zip ties (to account for any missing material drilled out) to melt the two pieces together. The "welds" aren't pretty but they've held up just fine.
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You'd never be able to tell I did any of this, and that's exactly what I wanted.